It seems likely that Colayn held a local office of some kind in Portsmouth early in 1435. He was among the eight townsmen named in the commission set up on 4 Mar. that year, who together with ‘other malefactors’ were alleged to have asaulted and resisted with force and arms certain commissaries of John, duke of Bedford, the admiral of England, in the execution of their duties in the town. Evidently, the fracas had arisen from a dispute over jurisdiction. The sheriff of Hampshire and his fellow commissioners were ordered to arrest and imprison the culprits, but whether they did so does not appear, and it was Bedford’s men rather than Colayn and his associates who were indicted before the j.p.s. a few weeks later.
Colayn appeared as a juror at Portsmouth in October 1448 when Chester Herald of Arms (John Chester alias Wryxworth*) made inquiries into the whereabouts of a cargo of 39 tuns of wine, wrongfully taken at sea and brought into the harbour.
